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Last Update: August 17, 2018•Date Posted: August 24, 2015•by Mike Dalisay➜Get FREE Updates Here
Previously, we learned how to create, read, update and delete database records on our PHP OOP CRUD tutorial. Today, we will put that knowledge to work by building a simple PHP shopping cart application.
This post will have the following contents:
1.0 Overview 2.0 Source code output preview 3.0 File structure
4.0 Prepare the database 4.1 Database design 4.2 Create MySQL tables 4.3 Database connection file 4.4 Output
5.0 Prepare the user interface 5.1 Create header layout file 5.2 Create footer layout file 5.3 Create navigation.php 5.4 Add custom CSS 5.5 Output
6.0 Display products 6.1 Create products.php 6.2 Include PHP classes 6.3 Create "product" object file 6.4 Create "product image" object file 6.5 Create "cart item" object file 6.6 Connect to the database 6.7 Initialize action and pagination 6.8 Request data from the database 6.9 Add "read" and "count" methods 6.10 Template to display products 6.11 Add "readFirst()" method 6.12 Add "exists()" method 6.13 Create pagination file 6.14 Output
7.0 How to count items in the cart? 7.1 Display count in navigation bar 7.2 Cart item count() method 7.3 Output
8.0 How to add to cart? 8.1 Make "add to cart" button work 8.2 Create add_to_cart.php 8.3 Put create() method 8.4 Create cart.php 8.5 Display message based on action 8.6 Display cart items 8.7 Put read() method in cart item object 8.8 Read products by IDs 8.9 Output
9.0 How to update cart? 9.1 Update cart quantity with JavaScript 9.2 PHP script to update cart 9.3 Update cart item in database 9.4 How to remove product from cart? 9.5 Put delete() method 9.6 Create the checkout page 9.7 Create place_order.php 9.8 Delete all items in the cart 9.9 Output
10.0 How to make the product page? 10.1 Create product.php 10.2 Read product details 10.3 Read one product method 10.4 Display message based on action 10.5 Display product thumbnails 10.6 Read images related to product 10.7 Display product image 10.8 Make image hover work 10.9 Display product details 10.10 Render 'Cart' button 10.11 Output
11.0 What People Say About This Code? 12.0 Download the LEVEL 1 Source Code 13.0 Download the LEVEL 2 Source Code 14.0 Download the PHP Shopping Cart Module 15.0 Download the PHP Shopping Cart SYSTEM
16.0 What's Next? 17.0 Related Tutorials 18.0 Notes
Before we start, we want to let you know that your feedback is important to us!
If you have a positive feedback about our work, please let us know. If there's a section in this tutorial that is confusing or hard to understand, we consider it as a problem. Please let us know as well.
Write your positive feedback or detailed description of the problem in the comments section below. Before you write a comment, please read this guide and our code of conduct. Thank you!
This is good news for you. If you do not want to use cookies or sessions for storing cart items, you can use your MySQL or MariaDB database.
Will there be any advantage if we use this approach?
One advantage I can think of is, the user can view his cart items in different computers or devices.
If we will compare it to using PHP sessions or cookies, we can say the following:
PHP sessions can maintains the cart items only when the browser is opened. It means a user will lose his cart items once he closes his browser or turns off his computer.
PHP cookies can maintain the cart items on one device or computer, event if the user turn his computer on and off.
The source codes in this page is NOT for you if:
You are an already an expert in PHP & MySQL programming.
You have a lot of time to code a shopping cart system from scratch.
You are not that interested in learning PHP & MySQL programming.
But, this SOURCE CODE is FOR YOU if:
You want to SAVE huge amount of development time.
You want to develop your own shopping cart system from scratch.
You determined to learn how to make a web application in PHP & MySQL.
But if you are an expert in PHP & MySQL programming and would like to take a look at our code, please do so! We'd love to hear your response and great insights! The comments section below is always open for anyone with questions and suggestions.
Below are some screenshots of our script’s output. You can click an image to view the larger version of it. Use the left and right arrow to navigate through the screenshots.
Please note that the following images are just output previews. New features might be added already the time you are reading this.
Note: If the output preview is in video format, please click the play button instead.
If you need the live demo link of our LEVEL 2 or PHP Shopping Cart Module, send an email request to mike@codeofaninja.com with a subject:
"DEMO REQUEST: PHP Shopping Cart with MySQL LEVEL 2" or "DEMO REQUEST: PHP Shopping Cart Module"
The LEVEL 2 and PHP Shopping Cart Module outputs proves that you can add and customize more features. It's easier and faster if you will learn by following our tutorial below.
Downloading our source codes is your huge advantage as well. For now, let's proceed to the step by step tutorial of our LEVEL 1 source code. Enjoy!
The following folders and files are included in the source code. It will have more meaning if you will see the code inside the folders and files.
├─ config/ ├─── database.php ├─ dev/ ├─── shop_cart_mysql_1.sql ├─── readme.txt ├─ images/ ├─ libs/ ├─── css/ ├────── bootstrap/ ├─── js/ ├────── jquery.js ├─ objects/ ├─── cart_item.php ├─── product_image.php ├─── product.php ├─ uploads/ ├─── images/ ├─ .htaccess ├─ add_to_cart.php ├─ cart.php ├─ checkout.php ├─ layout_foot.php ├─ layout_head.php ├─ navigation.php ├─ paging.php ├─ place_order.php ├─ product.php ├─ products.php ├─ read_products_template.php ├─ remove_from_cart.php ├─ update_quantity.php
You may run the following SQL queries on our "shop_cart_mysql_1" database.
Create the products table. This table will hold products record.
CREATE TABLE IF NOT EXISTS `products` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(512) NOT NULL, `description` text NOT NULL, `price` decimal(10,2) NOT NULL, `created` datetime NOT NULL, `modified` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (`id`)) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='products that can be added to cart' AUTO_INCREMENT=41 ;
Create product_images table. This table will hold images related to product.
CREATE TABLE IF NOT EXISTS `product_images` ( `id` int(11) NOT NULL AUTO_INCREMENT, `product_id` int(11) NOT NULL, `name` varchar(512) NOT NULL, `created` datetime NOT NULL, `modified` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`)) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='image files related to a product' AUTO_INCREMENT=105 ;
Create cart_items table. This table will hold cart items of our user.
CREATE TABLE IF NOT EXISTS `cart_items` ( `id` int(11) NOT NULL AUTO_INCREMENT, `product_id` int(11) NOT NULL, `quantity` double NOT NULL, `user_id` int(11) NOT NULL, `created` datetime NOT NULL, `modified` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`)) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=40 ;
The products and product_images table will not fully work without the sample data and images in the "/uploads/images/" directory.
You'll have to download the SQL and image files. Use the download button below. What will you get? A ZIP file with shop_cart_mysql_1.sql and 28 image files inside (1.30 MB).DOWNLOAD SQL FILE AND IMAGES
Once downloaded, you may import the SQL file using PhpMyAdmin. Put the image files in "/uploads/images/" directory. You are now one step closer to the output shown in section 2.1 above.
Create "config" folder and inside it, create "database.php" file with the following code.
<?php// used to get mysql database connectionclass Database{ // specify your own database credentials private $host = "localhost"; private $db_name = "shop_cart_mysql_1"; private $username = "root"; private $password = ""; public $conn; // get the database connection public function getConnection(){ $this->conn = null; try{ $this->conn = new PDO("mysql:host=" . $this->host . ";dbname=" . $this->db_name, $this->username, $this->password); }catch(PDOException $exception){ echo "Connection error: " . $exception->getMessage(); } return $this->conn; } }?>
Output screenshots are coming soon!
Layout files are needed so we can use the same header and footer code.
Create layout_head.php file and place the the following code.
<!DOCTYPE html><html lang="en"><head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title><?php echo isset($page_title) ? $page_title : "The Code of a Ninja"; ?></title> <!-- Latest compiled and minified Bootstrap CSS --> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" /> <!-- custom css for users --> <link href="libs/css/user.css" rel="stylesheet" media="screen"> </head><body> <?php include 'navigation.php'; ?> <!-- container --> <div class="container"> <div class="row"> <div class="col-md-12"> <div class="page-header"> <h1><?php echo isset($page_title) ? $page_title : "The Code of a Ninja"; ?></h1> </div> </div>
Create layout_foot.php file and place the following code.
</div> <!-- /row --> </div> <!-- /container --> <!-- jQuery (necessary for Bootstrap's JavaScript plugins) --><script src="https://code.jquery.com/jquery-3.2.1.min.js"></script> <!-- Latest compiled and minified Bootstrap JavaScript --><script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <!-- custom script will be here --> </body></html>
The "layout_head.php" will not work without the navigation.php file. Create that file and put the following code inside.
<!-- navbar --><div class="navbar navbar-default navbar-static-top" role="navigation"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="products.php">XYZ Webstore</a> </div> <div class="navbar-collapse collapse"> <ul class="nav navbar-nav"> <!-- highlight if $page_title has 'Products' word. --> <li <?php echo strpos($page_title, "Product")!==false ? "class='active'" : ""; ?>> <a href="products.php">Products</a> </li> <li <?php echo $page_title=="Cart" ? "class='active'" : ""; ?> > <a href="cart.php"> <!--later, we'll put a PHP code here that will count items in the cart --> Cart <span class="badge" id="comparison-count">0</span> </a> </li> </ul> </div><!--/.nav-collapse --> </div></div><!-- /navbar -->
Inside "libs/css" directory, create user.css with the following code inside it.
.text-align-center{ text-align:center; }.f-w-b{ font-weight:bold; }.display-none{ display:none; } .w-5-pct{ width:5%; }.w-10-pct{ width:10%; }.w-15-pct{ width:15%; }.w-20-pct{ width:20%; }.w-25-pct{ width:25%; }.w-30-pct{ width:30%; }.w-35-pct{ width:35%; }.w-40-pct{ width:40%; }.w-45-pct{ width:45%; }.w-50-pct{ width:50%; }.w-55-pct{ width:55%; }.w-60-pct{ width:60%; }.w-65-pct{ width:65%; }.w-70-pct{ width:70%; }.w-75-pct{ width:75%; }.w-80-pct{ width:80%; }.w-85-pct{ width:85%; }.w-90-pct{ width:90%; }.w-95-pct{ width:95%; }.w-100-pct{ width:100%; } .m-t-0px{ margin-top:0px; }.m-b-10px{ margin-bottom:10px; }.m-b-20px{ margin-bottom:20px; }.m-b-30px{ margin-bottom:30px; }.m-b-40px{ margin-bottom:40px; } .stock-text { font-weight: bold; color: #008a00;} .stock-text-red{ font-weight:bold; color:#b12704;} .product-detail { font-weight: bold; margin: 0 0 5px 0;} .blueimp-gallery>.prev, .blueimp-gallery>.next{ border:none; } .update-quantity-form { width: 150px; float: left; margin: 0 10px 0 0;} .cart-row { border-bottom: thin solid #f1f1f1; overflow: hidden; width: 100%; padding: 20px 0 20px 0;} .product-link{ color:#000000;} .product-link:hover{ color:#000000; text-decoration:none;} .product-img-thumb { margin: 0 0 10px 0; width: 100%; cursor: pointer;}
Now we are going to start displaying products from the database. Create products.php with the following basic code.
<?php// set page title$page_title="Products"; // page header htmlinclude 'layout_head.php'; // contents will be here // layout footer codeinclude 'layout_foot.php';?>
Put the following code after the opening "php" tag of the previous section.
// connect to databaseinclude 'config/database.php'; // include objectsinclude_once "objects/product.php";include_once "objects/product_image.php";include_once "objects/cart_item.php"; // connect to database here
Create "objects" folder. Inside it, create product.php file with the following code.
<?php// 'product' objectclass Product{ // database connection and table name private $conn; private $table_name="products"; // object properties public $id; public $name; public $price; public $description; public $category_id; public $category_name; public $timestamp; // constructor public function __construct($db){ $this->conn = $db; }}
Create product_image.php file inside "objects" folder.
<?php// 'product image' objectclass ProductImage{ // database connection and table name private $conn; private $table_name = "product_images"; // object properties public $id; public $product_id; public $name; public $timestamp; // constructor public function __construct($db){ $this->conn = $db; }}
Create cart_item.php file inside "objects" folder.
<?php// 'cart item' objectclass CartItem{ // database connection and table name private $conn; private $table_name = "cart_items"; // object properties public $id; public $product_id; public $quantity; public $user_id; public $created; public $modified; // constructor public function __construct($db){ $this->conn = $db; }}
Replace "// connect to database here" comment in products.php file with the following code.
// get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$product = new Product($db);$product_image = new ProductImage($db);$cart_item = new CartItem($db);
Put the following code after the code on the previous section.
// to prevent undefined index notice$action = isset($_GET['action']) ? $_GET['action'] : ""; // for pagination purposes$page = isset($_GET['page']) ? $_GET['page'] : 1; // page is the current page, if there's nothing set, default is page 1$records_per_page = 6; // set records or rows of data per page$from_record_num = ($records_per_page * $page) - $records_per_page; // calculate for the query LIMIT clause
Request data from the database. Put the following code after the code on the previous section.
// read all products in the database$stmt=$product->read($from_record_num, $records_per_page); // count number of retrieved products$num = $stmt->rowCount(); // if products retrieved were more than zeroif($num>0){ // needed for paging $page_url="products.php?"; $total_rows=$product->count(); // show products include_once "read_products_template.php";} // tell the user if there's no products in the databaseelse{ echo "<div class='col-md-12'>"; echo "<div class='alert alert-danger'>No products found.</div>"; echo "</div>";}
The previous section will not work without the following code inside "objects/product.php" object file.
// read all productsfunction read($from_record_num, $records_per_page){ // select all products query $query = "SELECT id, name, description, price FROM " . $this->table_name . " ORDER BY created DESC LIMIT ?, ?"; // prepare query statement $stmt = $this->conn->prepare( $query ); // bind limit clause variables $stmt->bindParam(1, $from_record_num, PDO::PARAM_INT); $stmt->bindParam(2, $records_per_page, PDO::PARAM_INT); // execute query $stmt->execute(); // return values return $stmt;} // used for paging productspublic function count(){ // query to count all product records $query = "SELECT count(*) FROM " . $this->table_name; // prepare query statement $stmt = $this->conn->prepare( $query ); // execute query $stmt->execute(); // get row value $rows = $stmt->fetch(PDO::FETCH_NUM); // return count return $rows[0];}
The previous section won't work without "read_products_template.php", so create that file and put the following code.
<?phpwhile($row = $stmt->fetch(PDO::FETCH_ASSOC)){ extract($row); // creating box echo "<div class='col-md-4 m-b-20px'>"; // product id for javascript access echo "<div class='product-id display-none'>{$id}</div>"; echo "<a href='product.php?id={$id}' class='product-link'>"; // select and show first product image $product_image->product_id=$id; $stmt_product_image=$product_image->readFirst(); while ($row_product_image = $stmt_product_image->fetch(PDO::FETCH_ASSOC)){ echo "<div class='m-b-10px'>"; echo "<img src='uploads/images/{$row_product_image['name']}' class='w-100-pct' />"; echo "</div>"; } // product name echo "<div class='product-name m-b-10px'>{$name}</div>"; echo "</a>"; // product price and category name echo "<div class='m-b-10px'>"; echo "$" . number_format($price, 2, '.', ','); echo "</div>"; // add to cart button echo "<div class='m-b-10px'>"; // cart item settings $cart_item->user_id=1; // we default to a user with ID "1" for now $cart_item->product_id=$id; // if product was already added in the cart if($cart_item->exists()){ echo "<a href='cart.php' class='btn btn-success w-100-pct'>"; echo "Update Cart"; echo "</a>"; }else{ echo "<a href='add_to_cart.php?id={$id}&page={$page}' class='btn btn-primary w-100-pct'>Add to Cart</a>"; } echo "</div>"; echo "</div>";} include_once "paging.php";?>
Add "readFirst()" method in "objects/product_image.php" file. The previous section will not work without it.
// read the first product image related to a productfunction readFirst(){ // select query $query = "SELECT id, product_id, name FROM " . $this->table_name . " WHERE product_id = ? ORDER BY name DESC LIMIT 0, 1"; // prepare query statement $stmt = $this->conn->prepare( $query ); // sanitize $this->id=htmlspecialchars(strip_tags($this->id)); // bind prodcut id variable $stmt->bindParam(1, $this->product_id); // execute query $stmt->execute(); // return values return $stmt;}
Open /objects/cart_item.php and add the following method. This method checks if an item is already added to cart or not.
// check if a cart item existspublic function exists(){ // query to count existing cart item $query = "SELECT count(*) FROM " . $this->table_name . " WHERE product_id=:product_id AND user_id=:user_id"; // prepare query statement $stmt = $this->conn->prepare( $query ); // sanitize $this->product_id=htmlspecialchars(strip_tags($this->product_id)); $this->user_id=htmlspecialchars(strip_tags($this->user_id)); // bind category id variable $stmt->bindParam(":product_id", $this->product_id); $stmt->bindParam(":user_id", $this->user_id); // execute query $stmt->execute(); // get row value $rows = $stmt->fetch(PDO::FETCH_NUM); // return if($rows[0]>0){ return true; } return false;}
The previous section won't work without the paging.php file. Create paging.php with the following code.
<?phpecho "<div class='col-md-12'>"; echo "<ul class='pagination m-b-20px m-t-0px'>"; // button for first page if($page>1){ echo "<li><a href='{$page_url}' title='Go to the first page.'>"; echo "First Page"; echo "</a></li>"; } $total_pages = ceil($total_rows / $records_per_page); // range of links to show $range = 2; // display links to 'range of pages' around 'current page' $initial_num = $page - $range; $condition_limit_num = ($page + $range) + 1; for ($x=$initial_num; $x<$condition_limit_num; $x++) { // be sure '$x is greater than 0' AND 'less than or equal to the $total_pages' if (($x > 0) && ($x <= $total_pages)) { // current page if ($x == $page) { echo "<li class='active'><a href=\"#\">$x <span class=\"sr-only\">(current)</span></a></li>"; } // not current page else { echo "<li><a href='{$page_url}page=$x'>$x</a></li>"; } } } // button for last page if($page<$total_pages){ echo "<li>"; echo "<a href='" . $page_url . "page={$total_pages}' title='Last page is {$total_pages}.'>"; echo "Last Page"; echo "</a>"; echo "</li>"; } echo "</ul>";echo "</div>";?>
Output screenshots are coming soon!
Open navigation.php and change this line:
<!--later, we'll put a PHP code here that will count items in the cart -->Cart <span class="badge" id="comparison-count">0</span>
to this:
<a href="cart.php"> <?php // count products in cart $cart_item->user_id=1; // default to user with ID "1" for now $cart_count=$cart_item->count(); ?> Cart <span class="badge" id="comparison-count"><?php echo $cart_count; ?></span></a>
Open /objects/cart_item.php and put the count() method.
// count user's items in the cartpublic function count(){ // query to count existing cart item $query = "SELECT count(*) FROM " . $this->table_name . " WHERE user_id=:user_id"; // prepare query statement $stmt = $this->conn->prepare( $query ); // sanitize $this->user_id=htmlspecialchars(strip_tags($this->user_id)); // bind category id variable $stmt->bindParam(":user_id", $this->user_id); // execute query $stmt->execute(); // get row value $rows = $stmt->fetch(PDO::FETCH_NUM); // return return $rows[0];}
Output screenshots are coming soon!
Put the following code before ending "body" tag of layout_foot.php file.
<script>$(document).ready(function(){ // add to cart button listener $('.add-to-cart-form').on('submit', function(){ // info is in the table / single product layout var id = $(this).find('.product-id').text(); var quantity = $(this).find('.cart-quantity').val(); // redirect to add_to_cart.php, with parameter values to process the request window.location.href = "add_to_cart.php?id=" + id + "&quantity=" + quantity; return false; });});</script>
Create add_to_cart.php file because when 'Add to cart' button was clicked, that file with the following code inside will be executed.
<?php// parameters$product_id = isset($_GET['id']) ? $_GET['id'] : "";$quantity = isset($_GET['quantity']) ? $_GET['quantity'] : 1; // make quantity a minimum of 1$quantity=$quantity<=0 ? 1 : $quantity; // connect to databaseinclude 'config/database.php'; // include objectinclude_once "objects/cart_item.php"; // get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$cart_item = new CartItem($db); // set cart item values$cart_item->user_id=1; // we default to '1' because we do not have logged in user$cart_item->product_id=$product_id;$cart_item->quantity=$quantity; // check if the item is in the cart, if it is, do not addif($cart_item->exists()){ // redirect to product list and tell the user it was added to cart header("Location: cart.php?action=exists");} // else, add the item to cartelse{ // add to cart if($cart_item->create()){ // redirect to product list and tell the user it was added to cart header("Location: product.php?id={$product_id}&action=added"); }else{ header("Location: product.php?id={$product_id}&action=unable_to_add"); }}?>
The previous section will not work without the following code inside our /objects/cart_item.php file.
// create cart item recordfunction create(){ // to get times-tamp for 'created' field $this->created=date('Y-m-d H:i:s'); // query to insert cart item record $query = "INSERT INTO " . $this->table_name . " SET product_id = :product_id, quantity = :quantity, user_id = :user_id, created = :created"; // prepare query statement $stmt = $this->conn->prepare($query); // sanitize $this->product_id=htmlspecialchars(strip_tags($this->product_id)); $this->quantity=htmlspecialchars(strip_tags($this->quantity)); $this->user_id=htmlspecialchars(strip_tags($this->user_id)); // bind values $stmt->bindParam(":product_id", $this->product_id); $stmt->bindParam(":quantity", $this->quantity); $stmt->bindParam(":user_id", $this->user_id); $stmt->bindParam(":created", $this->created); // execute query if($stmt->execute()){ return true; } return false;}
Create cart.php with the following basic code.
<?php// connect to databaseinclude 'config/database.php'; // include objectsinclude_once "objects/product.php";include_once "objects/product_image.php";include_once "objects/cart_item.php"; // get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$product = new Product($db);$product_image = new ProductImage($db);$cart_item = new CartItem($db); // set page title$page_title="Cart"; // include page header htmlinclude 'layout_head.php'; // contents will be here // layout footerinclude 'layout_foot.php';?>
We'll display message on cart.php based on given action. Put the following code after "include 'layout_head.php';" of the previous section.
$action = isset($_GET['action']) ? $_GET['action'] : ""; echo "<div class='col-md-12'>"; if($action=='removed'){ echo "<div class='alert alert-info'>"; echo "Product was removed from your cart!"; echo "</div>"; } else if($action=='quantity_updated'){ echo "<div class='alert alert-info'>"; echo "Product quantity was updated!"; echo "</div>"; } else if($action=='exists'){ echo "<div class='alert alert-info'>"; echo "Product already exists in your cart!"; echo "</div>"; } else if($action=='cart_emptied'){ echo "<div class='alert alert-info'>"; echo "Cart was emptied."; echo "</div>"; } else if($action=='updated'){ echo "<div class='alert alert-info'>"; echo "Quantity was updated."; echo "</div>"; } else if($action=='unable_to_update'){ echo "<div class='alert alert-danger'>"; echo "Unable to update quantity."; echo "</div>"; }echo "</div>";
Put the following code based on the code of the previous section.
// $cart_count variable is initialized in navigation.phpif($cart_count>0){ $cart_item->user_id="1"; $stmt=$cart_item->read(); $total=0; $item_count=0; while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){ extract($row); $sub_total=$price*$quantity; echo "<div class='cart-row'>"; echo "<div class='col-md-8'>"; // product name echo "<div class='product-name m-b-10px'>"; echo "<h4>{$name}</h4>"; echo "</div>"; // update quantity echo "<form class='update-quantity-form'>"; echo "<div class='product-id' style='display:none;'>{$id}</div>"; echo "<div class='input-group'>"; echo "<input type='number' name='quantity' value='{$quantity}' class='form-control cart-quantity' min='1' />"; echo "<span class='input-group-btn'>"; echo "<button class='btn btn-default update-quantity' type='submit'>Update</button>"; echo "</span>"; echo "</div>"; echo "</form>"; // delete from cart echo "<a href='remove_from_cart.php?id={$id}' class='btn btn-default'>"; echo "Delete"; echo "</a>"; echo "</div>"; echo "<div class='col-md-4'>"; echo "<h4>$" . number_format($price, 2, '.', ',') . "</h4>"; echo "</div>"; echo "</div>"; $item_count += $quantity; $total+=$sub_total; } echo "<div class='col-md-8'></div>"; echo "<div class='col-md-4'>"; echo "<div class='cart-row'>"; echo "<h4 class='m-b-10px'>Total ({$item_count} items)</h4>"; echo "<h4>$" . number_format($total, 2, '.', ',') . "</h4>"; echo "<a href='checkout.php' class='btn btn-success m-b-10px'>"; echo "<span class='glyphicon glyphicon-shopping-cart'></span> Proceed to Checkout"; echo "</a>"; echo "</div>"; echo "</div>"; } else{ echo "<div class='col-md-12'>"; echo "<div class='alert alert-danger'>"; echo "No products found in your cart!"; echo "</div>"; echo "</div>";}
Open /objects/cart_item.php and add the following code. The previous section will not work without it. This read() method will query the database and return the products added to the cart.
// read items in the cartpublic function read(){ $query="SELECT p.id, p.name, p.price, ci.quantity, ci.quantity * p.price AS subtotal FROM " . $this->table_name . " ci LEFT JOIN products p ON ci.product_id = p.id WHERE ci.user_id=:user_id"; // prepare query statement $stmt = $this->conn->prepare($query); // sanitize $this->user_id=htmlspecialchars(strip_tags($this->user_id)); // bind value $stmt->bindParam(":user_id", $this->user_id, PDO::PARAM_INT); // execute query $stmt->execute(); // return values return $stmt;}
The previous section will not work without the following "readByIds()" method inside "objects/product.php" file.
// read all product based on product ids included in the $ids variable// reference http://stackoverflow.com/a/10722827/827418public function readByIds($ids){ $ids_arr = str_repeat('?,', count($ids) - 1) . '?'; // query to select products $query = "SELECT id, name, price FROM " . $this->table_name . " WHERE id IN ({$ids_arr}) ORDER BY name"; // prepare query statement $stmt = $this->conn->prepare($query); // execute query $stmt->execute($ids); // return values from database return $stmt;}
Output screenshots are coming soon!
We have the 'update' button on cart.php file. When that button was clicked, a javascript code is triggered. Put the following code inside "$(document).ready(function(){" of layout_foot.php file.
// update quantity button listener$('.update-quantity-form').on('submit', function(){ // get basic information for updating the cart var id = $(this).find('.product-id').text(); var quantity = $(this).find('.cart-quantity').val(); // redirect to update_quantity.php, with parameter values to process the request window.location.href = "update_quantity.php?id=" + id + "&quantity=" + quantity; return false;});
The previous section will not work without the update_quantity.php file with the following code inside it.
<?php// get the product id$product_id = isset($_GET['id']) ? $_GET['id'] : 1;$quantity = isset($_GET['quantity']) ? $_GET['quantity'] : ""; // make quantity a minimum of 1$quantity=$quantity<=0 ? 1 : $quantity; // connect to databaseinclude 'config/database.php'; // include objectinclude_once "objects/cart_item.php"; // get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$cart_item = new CartItem($db); // set cart item values$cart_item->user_id=1; // we default to '1' because we do not have logged in user$cart_item->product_id=$product_id;$cart_item->quantity=$quantity; // add to cartif($cart_item->update()){ // redirect to product list and tell the user it was added to cart header("Location: cart.php?action=updated");}else{ header("Location: cart.php?action=unable_to_update");}?>
The previous section will not work without the following update() method inside /objects/cart_item.php file.
// create cart item recordfunction update(){ // query to insert cart item record $query = "UPDATE " . $this->table_name . " SET quantity=:quantity WHERE product_id=:product_id AND user_id=:user_id"; // prepare query statement $stmt = $this->conn->prepare($query); // sanitize $this->quantity=htmlspecialchars(strip_tags($this->quantity)); $this->product_id=htmlspecialchars(strip_tags($this->product_id)); $this->user_id=htmlspecialchars(strip_tags($this->user_id)); // bind values $stmt->bindParam(":quantity", $this->quantity); $stmt->bindParam(":product_id", $this->product_id); $stmt->bindParam(":user_id", $this->user_id); // execute query if($stmt->execute()){ return true; } return false;}
We have the 'remove' button on cart.php file. When that button was clicked, the remove_from_cart.php file with the following code will be executed.
<?php// get the product id$product_id = isset($_GET['id']) ? $_GET['id'] : ""; // connect to databaseinclude 'config/database.php'; // include objectinclude_once "objects/cart_item.php"; // get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$cart_item = new CartItem($db); // remove cart item from database$cart_item->user_id=1; // we default to '1' because we do not have logged in user$cart_item->product_id=$product_id;$cart_item->delete(); // redirect to product list and tell the user it was added to cartheader('Location: cart.php?action=removed&id=' . $id);?>
The previous section will not work without the following method inside our /objects/cart_item.php file.
// remove cart item by user and productpublic function delete(){ // delete query $query = "DELETE FROM " . $this->table_name . " WHERE product_id=:product_id AND user_id=:user_id"; $stmt = $this->conn->prepare($query); // sanitize $this->product_id=htmlspecialchars(strip_tags($this->product_id)); $this->user_id=htmlspecialchars(strip_tags($this->user_id)); // bind ids $stmt->bindParam(":product_id", $this->product_id); $stmt->bindParam(":user_id", $this->user_id); if($stmt->execute()){ return true; } return false;}
The checkout page looks like the cart page but the items cannot be updated or removed. It just like the summary of orders. Create checkout.php with the following code.
<?php// connect to databaseinclude 'config/database.php'; // include objectsinclude_once "objects/product.php";include_once "objects/product_image.php";include_once "objects/cart_item.php"; // get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$product = new Product($db);$product_image = new ProductImage($db);$cart_item = new CartItem($db); // set page title$page_title="Checkout"; // include page header htmlinclude 'layout_head.php'; // $cart_count variable is initialized in navigation.phpif($cart_count>0){ $cart_item->user_id="1"; $stmt=$cart_item->read(); $total=0; $item_count=0; while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){ extract($row); $sub_total=$price*$quantity; echo "<div class='cart-row'>"; echo "<div class='col-md-8'>"; echo "<div class='product-name m-b-10px'><h4>{$name}</h4></div>"; echo $quantity>1 ? "<div>{$quantity} items</div>" : "<div>{$quantity} item</div>"; echo "</div>"; echo "<div class='col-md-4'>"; echo "<h4>$" . number_format($price, 2, '.', ',') . "</h4>"; echo "</div>"; echo "</div>"; $item_count += $quantity; $total+=$sub_total; } echo "<div class='col-md-12 text-align-center'>"; echo "<div class='cart-row'>"; if($item_count>1){ echo "<h4 class='m-b-10px'>Total ({$item_count} items)</h4>"; }else{ echo "<h4 class='m-b-10px'>Total ({$item_count} item)</h4>"; } echo "<h4>$" . number_format($total, 2, '.', ',') . "</h4>"; echo "<a href='place_order.php' class='btn btn-lg btn-success m-b-10px'>"; echo "<span class='glyphicon glyphicon-shopping-cart'></span> Place Order"; echo "</a>"; echo "</div>"; echo "</div>"; } else{ echo "<div class='col-md-12'>"; echo "<div class='alert alert-danger'>"; echo "No products found in your cart!"; echo "</div>"; echo "</div>";} include 'layout_foot.php';?>
We'll use this file to show a "thank you" message and remove all items in the cart.
<?php// include classesinclude_once "config/database.php";include_once "objects/cart_item.php"; // get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$cart_item = new CartItem($db); // remove all cart item by user, from database$cart_item->user_id=1; // we default to '1' because we do not have logged in user$cart_item->deleteByUser(); // set page title$page_title="Thank You!"; // include page header HTMLinclude_once 'layout_head.php'; echo "<div class='col-md-12'>"; // tell the user order has been placed echo "<div class='alert alert-success'>"; echo "<strong>Your order has been placed!</strong> Thank you very much!"; echo "</div>";echo "</div>"; // include page footer HTMLinclude_once 'layout_foot.php';
The previous section will not work without the following method. Open /objects/cart_item.php and put it inside.
// remove cart items by userpublic function deleteByUser(){ // delete query $query = "DELETE FROM " . $this->table_name . " WHERE user_id=:user_id"; $stmt = $this->conn->prepare($query); // sanitize $this->user_id=htmlspecialchars(strip_tags($this->user_id)); // bind id $stmt->bindParam(":user_id", $this->user_id); if($stmt->execute()){ return true; } return false;}
Output screenshots are coming soon!
Create product.php with the following basic code.
<?php// include classesinclude_once "config/database.php";include_once "objects/product.php";include_once "objects/product_image.php";include_once "objects/cart_item.php"; // get database connection$database = new Database();$db = $database->getConnection(); // initialize objects$product = new Product($db);$product_image = new ProductImage($db);$cart_item = new CartItem($db); // get ID of the product to be edited$id = isset($_GET['id']) ? $_GET['id'] : die('ERROR: missing ID.');$action = isset($_GET['action']) ? $_GET['action'] : ""; // set the id as product id property$product->id = $id; // to read single record product$product->readOne(); // set page title$page_title = $product->name; // include page header HTMLinclude_once 'layout_head.php'; // content will be here // include page footer HTMLinclude_once 'layout_foot.php';?>
Put the following code after "$product_image = new ProductImage($db);" code of the previous section.
// get ID of the product to be edited and action$id = isset($_GET['id']) ? $_GET['id'] : die('ERROR: missing ID.');$action = isset($_GET['action']) ? $_GET['action'] : ""; // set the id as product id property$product->id = $id; // to read single record product$product->readOne(); // set page title$page_title = $product->name;
The previous section will not work without the "readOne()" method. Add the following method inside "objects/product.php" file.
// used when filling up the update product formfunction readOne(){ // query to select single record $query = "SELECT name, description, price FROM " . $this->table_name . " WHERE id = ? LIMIT 0,1"; // prepare query statement $stmt = $this->conn->prepare( $query ); // sanitize $this->id=htmlspecialchars(strip_tags($this->id)); // bind product id value $stmt->bindParam(1, $this->id); // execute query $stmt->execute(); // get row values $row = $stmt->fetch(PDO::FETCH_ASSOC); // assign retrieved row value to object properties $this->name = $row['name']; $this->description = $row['description']; $this->price = $row['price'];}
Open product.php file. Put the following code after ,span class="coan_code">include_once 'layout_head.php'; code.
echo "<div class='col-md-12'>"; if($action=='added'){ echo "<div class='alert alert-info'>"; echo "Product was added to your cart!"; echo "</div>"; } else if($action=='unable_to_add'){ echo "<div class='alert alert-info'>"; echo "Unable to add product to cart. Please contact Admin."; echo "</div>"; }echo "</div>"; // product thumbnail will be here
When these product thumbnails were hovered, it displayes a larger version of the image. It is Amazon-style.
Open product.php file and replace // product thumbnail will be here comment with the following code.
// set product id$product_image->product_id=$id; // read all related product image$stmt_product_image = $product_image->readByProductId(); // count all relatd product image$num_product_image = $stmt_product_image->rowCount(); echo "<div class='col-md-1'>"; // if count is more than zero if($num_product_image>0){ // loop through all product images while ($row = $stmt_product_image->fetch(PDO::FETCH_ASSOC)){ // image name and source url $product_image_name = $row['name']; $source="uploads/images/{$product_image_name}"; echo "<img src='{$source}' class='product-img-thumb' data-img-id='{$row['id']}' />"; } }else{ echo "No images."; }echo "</div>";
The previous section section will not work without the "readByProductId()" method inside "objects/product_image.php" file.
// read all product image related to a productfunction readByProductId(){ // select query $query = "SELECT id, product_id, name FROM " . $this->table_name . " WHERE product_id = ? ORDER BY name ASC"; // prepare query statement $stmt = $this->conn->prepare( $query ); // sanitize $this->product_id=htmlspecialchars(strip_tags($this->product_id)); // bind prodcut id variable $stmt->bindParam(1, $this->product_id); // execute query $stmt->execute(); // return values return $stmt;}
Only one product image are displayed at a time. This part displays the larger product image based on the hovered product thumbnail. Put the following code after the previous section's code.
echo "<div class='col-md-4' id='product-img'>"; // read all related product image $stmt_product_image = $product_image->readByProductId(); $num_product_image = $stmt_product_image->rowCount(); // if count is more than zero if($num_product_image>0){ // loop through all product images $x=0; while ($row = $stmt_product_image->fetch(PDO::FETCH_ASSOC)){ // image name and source url $product_image_name = $row['name']; $source="uploads/images/{$product_image_name}"; $show_product_img=$x==0 ? "display-block" : "display-none"; echo "<a href='{$source}' target='_blank' id='product-img-{$row['id']}' class='product-img {$show_product_img}'>"; echo "<img src='{$source}' style='width:100%;' />"; echo "</a>"; $x++; } }else{ echo "No images."; }echo "</div>";
Put the following jQuery code inside "$(document).ready(function(){" of layout_foot.php file.
// change product image on hover$(document).on('mouseenter', '.product-img-thumb', function(){ var data_img_id = $(this).attr('data-img-id'); $('.product-img').hide(); $('#product-img-'+data_img_id).show();});
This part display product price, description and category. Put the following code after the previous section's code.
echo "<div class='col-md-5'>"; echo "<div class='product-detail'>Price:</div>"; echo "<h4 class='m-b-10px price-description'>$" . number_format($product->price, 2, '.', ',') . "</h4>"; echo "<div class='product-detail'>Product description:</div>"; echo "<div class='m-b-10px'>"; // make html $page_description = htmlspecialchars_decode(htmlspecialchars_decode($product->description)); // show to user echo $page_description; echo "</div>"; echo "<div class='product-detail'>Product category:</div>"; echo "<div class='m-b-10px'>{$product->category_name}</div>"; echo "</div>";
Now we will display 'Add to cart' button if the product is not yet added to cart. Else, we will display 'update cart' button.
Place the following code after the previous section's code.
echo "<div class='col-md-2'>"; // cart item settings $cart_item->user_id=1; // we default to a user with ID "1" for now $cart_item->product_id=$id; // if product was already added in the cart if($cart_item->exists()){ echo "<div class='m-b-10px'>This product is already in your cart.</div>"; echo "<a href='cart.php' class='btn btn-success w-100-pct'>"; echo "Update Cart"; echo "</a>"; } // if product was not added to the cart yet else{ echo "<form class='add-to-cart-form'>"; // product id echo "<div class='product-id display-none'>{$id}</div>"; // select quantity echo "<div class='m-b-10px f-w-b'>Quantity:</div>"; echo "<input type='number' class='form-control m-b-10px cart-quantity' value='1' min='1' />"; // enable add to cart button echo "<button style='width:100%;' type='submit' class='btn btn-primary add-to-cart m-b-10px'>"; echo "<span class='glyphicon glyphicon-shopping-cart'></span> Add to cart"; echo "</button>"; echo "</form>"; }echo "</div>";
Output screenshots are coming soon!
I'm so glad that this code delights other people. The following are some of them from the comments section!
★★★★★ "Hey Mike, my name is Leonardo from Argentina. I've been reading your blog since like 4 months from now, and I really must say: your tutorials are very good, they has helped me in many of my works... Well, thank you very much man. I really admire your work." ~ Leonardo
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You can get the source code by following the whole, well detailed and free tutorial above. But isn’t it more convenient if you can just download the complete source code we used, and play around it?
There’s a small fee in getting the complete source code, it is small compared to the:
✔ Value or skill upgrade it can bring you, or
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✔ Precious time you save.
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✔ Expert advice and support (if you have any questions related to the source code)
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For a limited time, I will give you the source code for a low price. DOWNLOAD THE SOURCE CODE LEVEL you desire by clicking its the BUY button below.
The LEVEL 1 Source code has the following features:
FEATURE
LEVEL 1
Learn to code a simple cart function
Yes
List all products from MySQL database
Yes
Add to cart action button
Yes
Remove from cart action button
Yes
Show message about a product added to cart
Yes
Show message about a product removed from cart
Yes
Navigation bar highlights which page is selected
Yes
Cart link shows count of products added in the cart
Yes
Show message if no products found in database
Yes
Show message if no product found in cart
Yes
Bootstrap enabled UI
Yes
Cart page that lists all products added to cart
Yes
Auto-compute total cost of all products added to cart
Yes
Specify and save cart quantity
Yes
Update cart quantity
Yes
PDO extension used
Yes
Step by step tutorial
Yes
Free code updates
Yes
Free support for 6 months
Yes
LEVEL 1 Source Code$19.99
LEVEL 2 Source Code$29.99
LEVEL 3 Source Code$49.99
Download the LEVEL 2 Source code, it has more features such as:
FEATURE
LEVEL 2
List all products from MySQL database
YES
Pagination on products list page
YES
Navigation bar has drop down of product categories
YES
Highlight selected category in drop down
YES
Categories are retrieved from the database
YES
Show products by category
YES
List products under a category with pagination
YES
Search product
YES
Search results with pagination
YES
Search box located on upper right corner of navigation bar
YES
Search box requires search term before clicking the search button
YES
Add to cart action button
YES
Quantity text box beside the add to cart button
YES
Quantity text box required to be a number
YES
Quantity text box required to have a minimum value of 1, negative value not allowed
YES
Remember the page number where the user clicked the "Add to cart" button
YES
Single product view
YES
Add to cart text box and button in single product view
YES
Quantity text box has up and down arrow for changing value
YES
Remove from cart action button
YES
Show message about a product added to cart
YES
Disable products already added in the cart
YES
Show message about a product removed from cart
YES
Navigation bar highlights which page is selected
YES
Cart link shows count of products added in the cart
YES
Show message if no products found in database
YES
Show message if no product found in cart
YES
Well formatted money value
YES
Check out button with cart icon
YES
Bootstrap enabled UI
YES
Cart page that lists all products added to cart
YES
Quantity text box beside update quantity button
YES
One click empty cart button
YES
Auto-compute total cost of all products added to cart
YES
Used PDO bindParam() to prevent SQL injection in MySQL queries
YES
Used PHP htmlspecialchars() to prevent XSS attacks
YES
SQL file is in the "dev" folder
YES
PDO extension used
YES
Free code updates
YES
Free support for 6 months
YES
LEVEL 1 Source Code$19.99
LEVEL 2 Source Code$29.99
LEVEL 3 Source Code$49.99
It has several features you will enjoy learning. Some examples: how to handle the users, shopping cart and ordering using the PHP & MySQL technology. Click here to learn more or download it now using the button below.
LEVEL 1 Source Code$19.99
LEVEL 2 Source Code$29.99
LEVEL 3 Source Code$49.99
Many of you requested this source code. You needed a shopping cart system with user management (merchant and customer), product management, category management, order management, security and more features based on our source codes here in codeofaninja.com. Click here to learn more.
We made another version of this tutorial. We used PHP session variables to store cart data. This is a great tutorial about PHP sessions.
You can find the tutorial here: PHP and MySQL Shopping Cart Tutorial – Using SESSIONS To Store Cart Data
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